<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- html 结构 由外到内 从上到下 -->
    <!-- 取类名是个技术活
    1.page结构命名套路
    2.__ BEM国际命名规范 
    3. page Block 兴起一个区块
    4.page__hd 子元素 Element
    -->
    <div class="page">
        <div class="page__hd">
            <h1 class="page__title">button</h1>
            <p class="page__desc"></p>
        </div>
        <div class="page__bd"></div>
        <!-- <div class="page__ft"></div> -->
    </div>
</body>

</html>